Renewable fuse



M'. PODELL.

RENEWABLE FUSE.

APPLICATION FILED JUNE 16. 1919.

1 396,460. Patented Nov. 8, 1921.

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PATENT OFFICE.

MORRIS PODELL, OF NEW YORK, N. 'Y.

RENEWABLE FUSE.

Specification of Letters Patent.

Patented. Nov. 8, 1921.

Application filed June 16, 1919. Serial No. 304,528.

To all whom it may concern:

, Be it known that I, MORRIS PoDnLL, a citizen of the United States, residin in New York city, in the county of New ork and State of New York, have invented certain new and useful Improvements in Benewable Fuses, of which the following is a specification.

My present invention relates to an improvement in renewable fuses, more especially of the plug type, and has for its object an improved method of replacement of the fusible member thereof.

Another advantage is the reduction of the number of orifices running from the exterior to the interior of such plug.

In the accompanying drawing,--

Figure l is an elevation of my device;

Fig. 2 is a sectional view thereof taken on the line 11, Fig. 1;

Fig. 3 is a sectional view taken on the line 3-3, Fig. 2, looking in the direction of the arrow;

Fig. 4; is a bottom view thereof with the lower cap and other parts removed showing the interior of the plug; and

ig. 5 is a sectional vew of the renewable fuse element.

,My improved device, which is made of some di-elect-ric material of suitable nature,

but preferably of some vitreous material such as porcelain, is comprised of two members, namely the body portion 1 and the cap portion 2, the two being parted at about the line 3, as shown in section, Fig. 2. The outer lower portion of the body member 1 is preferably cast with a suitable thread 4 thereon so as to permit the same to be screwed into the standard plug socket in well-known commercial use.

The lower cap member thereof, which is made of the same material, as the body 1 is arranged so as to be inserted into the cap receiving recess generally denoted by 5 which is located in the bottom of the body member 1, after which a suitable conductive shell 8, having a corresponding threadlike contour, is screwed upon the body member l, the lower led e 6 thereof coming in contact with the sald cap member 2 and holding the same in operative position, thereby effectively sealing the bottom of said body member 1 and leaving an interior chamber generally denoted by 7. The bottom cap member 2 is provided with a recessed aperture 9 having a shoulder portion 10 located about midway therein, the said aperture being of suitable diameter to receive therein a renewable fuse cartridge generally denoted by 11, the construction of which is as disclosed in Fig. 5, being entirely similar to that shown in U. S. Patent to Louis E. Weinberg, No. 1,226,151, issued May 15, 1917, and assigned to the Star Fuse Company, Inc, of New York.

The fuse comprises a metal cartridge cap A, a glass tubular case B, a suitable fusible connector C of rectangular cross-section, and a sealing member D, for the tube B, through which the fusible member C pro- JGClZS.

It will be noted that the fusible member, which is in electric connection with the bottom portion of the metallic cap A, extends upwardly and to a considerable length above the body of the glass casing B and this particular feature will now be described.

In practice, I so make the aperture 9 in the cap 2 of such diameter as to practically fit the glass casing B, and the recessed shoulder 10 acts as a stop for the metallic fuse cap A thereby limiting the extension of the renewable fuse member 11 into the chamber 7. The topportion of the body member 1 is provided with a recessed aperture generally denoted by 12 and into which recess is inserted the outer extension C of the fusible element. This last noted extension is of such proportion that when the entire renewable fuse member 11 is introduced into the bottom cap member 2, the extension C extends outwardly and beyond the top of the body member 1 as at E and is afterward bent over as at F, Fig. 2, thereby aiding to maintain the entire fusible member 11 in operative position.

In addition thereto, this exposed portion F of the fusible member 11 may have stamped thereon the amperage or other necessary data that is desired, this last noted feature however being not shown.

By referring to Fig. 4, which is a plan view of the body member 1 with the cap 2 removed, it will be noted that the recessed aperture 12 has a two-dimensioned opening, namely one larger portion 13 with which to receive the ends of two spring clip terminals 15 and 16, and a Smaller proportioned opening 14 through which to introduce the extension G' of the fusible element.

It will be further noted that adjacent one side thereof, the body member 1 is provided with a second elongated aperture 17 into which the opposite end of the spring clip member 15 is introduced. There is also arranged a screw aperture 18 which traverses the last said opening 17 in such a manner as'to permit the introduction of a fastening and tension screw 19 therein having threaded engagement in a tapped aperture in the clip 15. A recessed aperture extension 20 is also provided to permit of the deep introduction of the screw head in order to avoid V the possibility of accidental contact.

Preferably diagonally oppositely located to the last said apertures is another aperture 7 21, through which a contact extension, of

the spring terminal member 16 extends, at which point 22 the said member is soldered or otherwise electrically connected to the conductive shell member 8 so as to form an electric contact therewith.

Both of the spring terminal members 15,

, 1 6, are soconstructed that when released from the screw pressure 19 they will open slightly thereby permitting the extension C of. the fusible member 11 to be readily introduced therein and. after the renewable fusible member has been introduced into its operative seat as. shown. in Fig. 2, the

, screw 19. is screwed home, thereby closing the upper ends of the terminal members 15 and '16, compressing between them the ex- 7 tension. G of the fuse, thereby making a per-- fect electrical contact therebetween.

' V cient distance so that when the entire fuse member is screwed into its receiving socket,

:the extension G makes. a sure contact with the conductor contact as provided in all well- .known types of plug sockets.

When my device is;in operative position and in use, the currentflows as follows Through the head cap A on to the fusible member C; from thence to the terminal member 16 and from thence into the outer threaded conductive shell 8. 7

As is customary, due to any variation or fluctuation of the current reaching an excessive amount, the fuse will blow at some point'between the headcap Aand the upper end of thelower restricted portion of the fuse. When this occurs, the plug can be an screwed, the screw 20. unloosened, the extension C removed from the aperture12, 14:, and

the renewable member 11 removed and an entire new fuse 11 replaced.

Having thus described my invention, what I claim is 1. In combination, a hollow dielectric body; a conducting shell on said body; a

adapted to be adjusted to tightly and rel'eas ably clamp said fuse on the contact member. 2. In combination, a hollow dielectric body; a conducting shell on said body; a pair of approximately, contacting members in said body, one being connected to said shell; a removable dielectric case in said body and having a metal outer end; and a fuse connected to said outer end and having its inner end passed between said contact portions.

3. In combination, a dielectric body'provided with a chamber open at its inner end; a conducting shell on said body; a pair of contact members at the inner end of said chamber, one being connected to said shell; a removable dielectric case disposed in said body and provided with a sealed inner'end and a metal closure at its outer end; afuse connected to said closure and, having 'its inner end projecting from the casing and passed between said contact members;'and a screw for clamping said contact members directly to the fuse. a 1

4. In combination, a dielectric bodyprovided with a chamber open at its inner end, and an aperture extending from the inner end of the chamber; a threaded conducting shell on said body; apair of spring clip members having contact portions in said aperture and diverging in said chamber, one

being connected to said shell;;a removable dielectric case disposed in said chamber and provided with a sealed inner end and a metal cap at its outer end; and a fuse connected to said cap and havingits nmer end passed between'said contact portions.

5. In combination, a dielectric body portion provided with a chamber open at its inner end, a recessed aperture extending from the inner end of the chamber, anda transverse screw aperture extending from a side face of said recessed aperture to the side face of the body; a threaded conduct ing shell on said bodyportion; a pair of spring clip members having contact portions disposed in said recessed aperture, one bemgconnected to said "shell; a removable glass tubular case 'disposedin said open end and provided with a sealedv inner end and a metal cap at its outer end; a 'fuse having its outer end connected to said cap and its inner end passed between said contact portions; and a screw in said screw aperture clamping said contact portions together upon the fuse.

6. In combination, a dielectric body provided with a chamber having a large opening at the inner end of the body and a recessed aperture extending from the inner end of the chamber to the outer end of the body; a threaded conducting shell on said body portion; a pair of spring clip members having contact portions disposed nearly fiat against each other in said recessed aperture and diverging in said chamber, one being electrically connected to said shell; a removable dielectric case disposed in said large opening and provided with a sealed inner end and a metal cap at its outer end; a fusible connector having one end electrically connected to said cap and the other end passed between said contact portions and projecting and bent over at the outer end of said recessed aperture; and means for clamping said contact portions together upon said connector.

7. In combination, a dielectric body pro vided With a chamber having a large opening at the inner end, a recessed aperture extending from the inner end of the chamber to the outer end face of the body, a transverse screw aperture extending from said fiat aperture to a side face of the body, an elongated aperture extending from said chamber and intersecting the screw aperture, and a radial aperture communicating With the chamber; a threaded conducting shell on said body portion; a pair of spring clip members having contact portions disposed in said fiat recessed aperture and diverging in said chamber, one being passed through said radial aperture and electrically connected to said shell, the other being passed through said elongated aperture and provided with a tapped opening; a removable glass tubular case disposed in said large opening and sealed member at its inner end and having a cartridge cap at its outer end; a fusible connector having a re duced outer end secured to said cap and its inner end passed between said contact portions and projecting and bent over at the outer end of said recessed aperture; and a screw in said screw-aperture and tapped opening for clamping said contact portions together.

MORRIS PODELL. Witnesses:

H. D. PENNEY,

FREDERICK T. SASS. 

